LIB. II. 12. 165 



genere ulterius inquirendum est, utrum corpora, quae 

 emittuntur ex machinis, (qualia sunt pilae ex tormcntis) 

 non ex ipsa percussione contrahant aliquem gradum 

 caloris; adeo ut postquam deciderint, inveniantur non- 

 nihil calida. At aer motus magis infrigidat quam cale- 

 facit ; ut in ventis, et follibus, et flatu oris contract! 70 . 

 Verum hujusmodi motus non est tarn rapidus ut ex- 

 citet calorem ; et fit secundum totum, non per particu- 

 las: ut mirum non sit, si non generet calorem. 



Ad decimam scptimam. 



23. Circa hanc instantiam facienda est inquisitio 

 diligentior. Videntur enim herbae et vegetabilia viri- 

 dia et humida aliquid habere in se occulti caloris. Tile 

 vero calor tarn tenuis est, ut in singulis non percipiatur 

 ad tactum : verum postquam ilia adunata sint et con- 

 clusa, ut spiritus ipsorum non expiret in ae rern, sed se 

 invicem foveat 71 ; turn vero oritur calor mauifestus, et 

 nonnunquam flamma in materia congrua. 



Ad decimam octavam. 



24. Etiam circa hanc instantiam diligentior facienda 

 est inquisitio. Videtur enim calx viva, aqua aspersa, 

 concipere calorem ; vel propter unionem caloris, qui 

 antea distrahebatur, (ut ante dictum est herbis conclu- 



70 Bodies passing through Air be- coverings of wool or skin. &quot; Fit se- 



come hot by friction as Meteors : cundum totum, non per particulas.&quot; 



but Air in Motion causes coolness, By this, I suppose, Bacon means, 



because of its carrying off the Calo- it affects the whole body generally, 



ric of the Body. The radiation and does not cause friction of its 



of Heat from a body is more separate particles. This view is of 



rapid when the Heat is continually course wrong, 



being removed by a current of 71 g o d am p hayricks are set on 



Air, and the equilibrium of Heat fire. The close confinement of Air 



thereby hindered. The contrary ef- creates great Heat; and there is a 



feet is produced when the radiation process of fermentation going on 



of Heat from bodies is impeded (cf. also, 

 supra Inst. 19) by thick and close 



